A120278 - cp's OEIS frontend

A120278 a(n) = Sum_{m=1..n} Sum_{k=1..m} C(2k,k), where C(2k,k) = (2*k)!/(k!)^2 = A000984(k).

n	a(n)
1	2
2	10
3	38
4	136
5	486
6	1760
7	6466
8	24042
9	90238
10	341190
11	1297574
12	4958114
13	19019254
14	73196994
15	282492254
16	1092867904
17	4236849774
18	16455966944
19	64020347914
20	249431257704
21	973100041934
22	3800867789884
23	14862066265434
24	58170868424084

[2, 10, 38, 136, 486, 1760, 6466, 24042, 90238, 341190, 1297574, 4958114, 19019254, 73196994, 282492254, 1092867904, 4236849774, 16455966944, 64020347914, 249431257704, 973100041934, 3800867789884, 14862066265434, 58170868424084]

cp's OEIS Frontend

A120278 a(n) = Sum_{m=1..n} Sum_{k=1..m} C(2k,k), where C(2k,k) = (2*k)!/(k!)^2 = A000984(k).

Table of values

List of values

cp's OEIS Frontend

A120278 a(n) = Sum_{m=1..n} Sum_{k=1..m} C(2*k,k), where C(2*k,k) = (2*k)!/(k!)^2 = A000984(k).

Table of values

List of values

A120278 a(n) = Sum_{m=1..n} Sum_{k=1..m} C(2k,k), where C(2k,k) = (2*k)!/(k!)^2 = A000984(k).